Recent content by cgw

  1. C

    Not quite clear in application of fourier series

    I am not quite clear on the use of Fourier series to solve the Schrodinger equation. Can you point me to a source of some simple one dimensional examples?
  2. C

    Liboff Quantum Mech Solutions: Non-Student Guide

    Any way to get solutions for the problems in Liboff - Introductory Quantum Mechs 4th Ed? (I'm not a student.)
  3. C

    Why does grounded imply V = 0 ?

    Basically is it how the phases of the electrical system are connected. The voltage is a potential between phases. A wye connected 208 volt transformer has it's center leg connected to ground which we call 0. Then there is 120 volts between a phase pole and the ground pole and 208 volts between...
  4. C

    Can Gravitons Escape Black Holes?

    Not sure I get this. Elect-mag radiation is quantized and is compatable with field theory. Right?
  5. C

    Why is a changing magnetic field and changing electric field perpendicular?

    You are correct about Maxwell's equations. I was just reading about this the other night in The Feyman Lectures on Physics. If you have access to this book (Vol II) it is covered pretty well. Maybe someone here can put it in a nutshell though.
  6. C

    Can Gravitons Escape Black Holes?

    Maybe a simple or stupid question so bear with me (it is late and I just thought of this). Assuming the existence of gravitons and assuming they are mass-less and travel the speed of light - how can they escape a black hole? Please point me in the right direction.
  7. C

    Transient solution for a semi-infinate solid from a pipe

    I am interested in several things. The conductivity of copper is about 1000X that of PEX but with the pipe buried in sand we do not need 1000X the amount of PEX for the same heat transfer. I did look at it as a steady state problem but it really is a transient problem. As I mentioned the...
  8. C

    Transient solution for a semi-infinate solid from a pipe

    Any practical application I can think of would have a moving fluid in the pipe. Maybe a constant temperature at the pipe surface would approximate the situation close enough. One of the applications I am looking at is the heat transfer difference when using a copper pipe vs. a plastic pipe.
  9. C

    Transient solution for a semi-infinate solid from a pipe

    I am now thinking that the boundry layer makes a significant difference. I am trying a finite difference with small delta r and small delta t on a spread sheet. It is limited but at least the numbers seem right.
  10. C

    Transient solution for a semi-infinate solid from a pipe

    My application is a pipe with a constant temperature fluid (water) buried in a solid (the ground) with a initial (lower) constant temperature at t=0. What is the temperature at time t and distance r? When will the heat transfer drop off to a certain rate? I though this would simple and the...
  11. C

    Transient solution for a semi-infinate solid from a pipe

    \theta = \mbox{erf} \left(\frac{x}{2\sqrt{\alpha t}}\right) is the solution to the one dimensional semi infinite solid. The radius of the pipe is too small to approximate it as a plane. The pipe wall thickness can be ignored for now (it is << than the solid). The function is...
  12. C

    Transient solution for a semi-infinate solid from a pipe

    Does anyone have a solution for the heat transfer from a pipe into a solid. I am looking for the temperature in the solid based on radius and time and also the heat transfer based on time. The temperature in the pipe (surface of the solid) is constant. The solid has a constant lower temperature...
  13. C

    Heat transfer from a tube into a solid

    The only question is the difference between PEX and copper pipe. All else would remain equal. So the question is (I think) what effect would the difference in conductivity have on the over all resistance between the deep sand and the water (per foot).
  14. C

    Heat transfer from a tube into a solid

    What is the effect of different tube material (conductivity) on the heat transfer from water in an infinite tube to a surrounding infinite solid? The actual practical application is transfer of heat from hot water (~180F) in 3/4" tubes into sand for heat storage (and then the transfer back)...
  15. C

    Modern Physics Textbook Suggestions

    I have a blue hardback 1966 copy. Whre does that fit in? Same as blue paperback?
Back
Top